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Incidentally, this bug also occurs with the gentoo package :
bash-4.0_p35.ebuild as well as building from the git repository:
git://git.savannah.gnu.org/bash.git .
Only building after reconfiguration with
'--with-installed-readline' and '--without-bash-malloc' fixes.

For emacs users such as myself, a common typo is to use
the emacs "literal next" keystroke (^Q) in the shell,
with default stty(1) settings this is a terminal "start",
to resume from a suspend / "stop" (^S) .
I believe a terminal "start" without any preceding "stop"
should be ignored by the shell, as it is by ksh and
previous bash versions (eg. bash-3.2.39 ).

However, now with :
GNU bash, version 4.0.35(3)-release (x86_64-unknown-linux-gnu)

inadvertently using the "^Q" keystroke when preceded by an escape "\\" character causes bash heap corruption and to crash,
as shown by this "gdb" session :